Liquid or gaseous fuel burning furnace



March 18, 1924. 3 431241 O. L M. HOOVER LIQUID OR GASEOUS FUEL BURNING FURNACE Filed Jan. 22. 1923 2 Sheets-Sheet 1 5 ji A My i it HIV A Kiri a r /24/ W// 1 f a W v H if; v v

V gwuawtoz March 18, 1924; 1,487,241.

' O. L. M. HOOVER LIQUID OR GASEOUS FUEL BURNING FURNACE Filed Jan. 22, 1923 2 Sheets-Sheet Patented Mar. 18, 1924.

Mrs!) STATES PATENT v()FFICE.

ORVILLE L. M. HOOVER, OFVDALLAS, TEXAS, ASSIGNOR or ONE-HALF T0 10F DALLAS, TEXAS.

LIQUID 0R GASEOUS FUEL-BURNING FURNACE.

Application filed January 22, 1923. Serial No. 614,152.

To all whom it may concern:

Be it known that I, ORVILLE L. M. Hoovnn, citizen of the United States of America, residing at Dallas, in the county of Dallas and State of Texas, have invented certain new and useful Improvements in Liquid or Gaseous Fuel Burning Furnaces, of which the following is a specification.

. This invention relates to new and useful improvements in liquid or gaseous fuel burnmg furnaces.

The ob ect of the invention is to provide certain improvements in furnace forming the subject matter of my Letters Patent No.

1,370,446, issued March 1, 1921, and also to produce in such a furnace advantages makmg for efliciency and economy.

A particular object of the invention is to provide a superheating coil in the fiues of the pre-heating'chamber, whereby. the fuel is heated to a highly combustible condition prior to its introduction into the burner.

Another object is to provide dampers in the pie-heating fiues instead of at the ports between the pre-heating and combustion chambers, whereby a more efiicient arrangement may be had and both dampers controlled by a single operating means.

A further object is to provide baffles in the combustion chamber in connection with a fire arch at the forward end of the chamber, whereby the flame from the burner may more efficiently heat the boiler or still and any back or counter-acting drafts may be controlled.

A construction designed to carry out the invention will be hereinafter described, to-

gether with other features of the invention.

The invention will be more readily understood from a reading of the following spec ification and by reference to the accompanying drawings, in which an example of the invention is shown, and wherein:

Fig. 1 is a longitudinal vertical sectional view, v a

Fig. 2 is a horizontalcross-sectional view on the line 22 ofFig. 1,

Fig. 3 is a plan View of the furnace,

Fig. 4: is a partial front elevation, and

Fig. 5 is a transverse sectional view on the line 55 of Fig. 3.

In the drawings, the numeral 10 desig- M. D. noovna,

nates the front wall of a furnace housing,

11 the rear wall and 12 and 13 the side walls.

These walls and the other parts of the furnace are to beconstructed of such materials as are commonly used 1n the art. At the front of the furnace an arched opening 14 front wall. These baffle walls are spaced apart to form parallel air flues A, B, and C on each side of a central air flue D. Arc uate pockets 17 meet at a point relatively centrally of the flue D and connect the rear ends of the fines A, B, and O on eachside. The flues B, C, and D have their front ends open at the arch opening lt so as to permit the passage of air thereinto. Air entering these flues will be drawn to the rear end of the pre-heating chamber and deflected by the pockets 17 into the flues'A. At the forward ends of the flues A, ports 18 in the floor 15 establish communication with the forward end of the combustion chamber. It will be seen that air entering the fines B,

C, and D will be thoroughly heated and circulated thru the pre-heating' chamber. The

rear ends of the baflie walls 16 may be Transverse baffles 20 extending from the sidewalls are directed forwardly and intersect the forward ends of longitudinal baffies 21 extending rearwardly. The-baffles 20 extend from the floor to the arch and the air currents admitted from the pre-heatmg chamber thru the ports 18 are deflected toward the center of the chamber under the the ports 18 are compelled to pass into the the side walls 12 and 13.

throat instead of seeking a general escape in the chamber.

In order tocontrol the draft and the flow V of the pre-heated air currents I arrange dampers 22 transversely of the flues A centrally on a transverse rock shaft 23 mounted in bearing sleeves 2% supported in the walls 16, the ends of the shaft having bearings in connected in the shaft in the flue D and has the rear end of a lever 26 pivoted in its de pending member. The lever has a handle 27 with notches 28 in its under edge for engaging over a bar 29 disposed transversely in the flue D. By moving the lever longitudinally the dampers 22 are swung to obstruct the passage of air thru the fines A. hen the dampers are vertical the said lines are entirely closed and by swinging said dam pers to different inclinations the passage of air or draft of the furnace will be regulated thereby. The handle 27 is within easy reach of the engineer and the dampers may be readily adjusted.

l/Vhile the preheating of the air currents passing thru the flues, due to the heat radiation from the floor 15, is highly important and advantageous, a particular feature which makes for efficiency and economy, resides in a pair offuel superheating coils 30 disposed in the flues B and C and looped into the rear ends of the flues A and curved around the pockets 17. Each coil is connected with a cut-off valve 31 connected with a pipe 32 for supplying oil, gas or other fluid fuel. Each coil enters the flue B and conveys the fuel fluid thru the flues B, pocket 17, rear end of flue A and returns it thru the pocket 17 and flue C. The discharge end of each coil extends thru the opening 14: and is connected with an upwardly extending burner pipe 33. By this means the fuel fluid is heated to a highly combustible con dition and makes for a hotter flame and a re duction in fuel consumption. The combustion of the pre-heated air currents and the super-heated fuel makes a highly eflicient furnace. In order to determine the temperature of the super-heated fuel'fluid, a suitable indicating device 3 1 may be mounted on the dlscharge end of each 0011.

A T joint is In operating the furnace, cool or fresh air is admitted to the flues B, C and D thru the opening 14 and caused to circulate around the baffle walls 16 and contact with the bottom of the floor 15, which latter is heated by the burner in the combustion chamber above. The air passing thru the pie-heating chamber is heated a maximum temperature and is conducted forwardly in the flues A to the ports 18. The heated air currents pass thru. the port and are deflected toward the center of the chamber by the arch 19 and baffles 20. The passage of the air thru the ports, and thus the draft, may be controlled and regulated by manipulating the dampers 22.

The air heated to its maximum pre-heated the parts as well as modifications may be made within the scope of the appended claims.

What I claim, is:

1. In a furnace of the character described, a housing divided into superposed pre-heating and combustion chambers having communicating openings at their forward ends at each side thereof, the bottom of the com bustion chamber forming the top of the preheating chamber, the front wall of the housing having an air admitting opening communicating with the pre-heating chamber, longitudinal baffle walls in the preheatin chamber forming air circulating flues, sai flues communicating at their rear ends and the outermost flues connecting with the combustion chamber, draft controlling dampers arranged in the outside flues, means for operating the dampers, transverse baffles in the combustion chamber, a longitudinal throat extending rearwardly from the baffles, and an arch at the front end of the combustion chambers covering the baflies and the communicating openings between the chambers, the throat extending beyond the arch.

2. In a furnace of the character described, a housing divided into superposed pre-heating and combustion chambers having communicating openings at their forward ends at each side thereof, the bottom of the combust-ion chamber forming the top of the preheating chamber, the front wall of the housing having an air admitting opening communicating with the preheating chamber forming air circulating flues, said flues comnmnicaing at their rear ends and the outermost flues connecting with the combustion chamber, draft controlling dampers arranged in the outside fines, means for operating the dampers, transverse bafiles in the combustion chamber, a longitudinal throat extending rearwardly from the baffles, an arch at the front end of the combustion chambers covering the baflies and communieating openings between the chambers, the throat extending beyond the arch and superheating fuel fluid coils passing thru the fiues of the pre-heating chamber.

In testimony whereof I aflix my signature.

ORVILLE L. M. HOOVER. 

